Bulging bottom, bent casing and "crust" around were the wires exit the capacitor is all indication of bad cap.
You can use ohmmeter, depending on the meter, the resistance of the capacitor could start out low but should end as infinite.
There is also a special type of ohmmeter called ESR meter that measures E.quelant S.eries R.esistance (is the name coincidence?) If the capacitor has started to dry out, (there is liquid inside it, when it dries the capacitor becomes useless), then the ESR rises. This meter Here
is about 90 dollars including shipping.